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Some questions on my AC 172 rotary mower...
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garden_guy View Drop Down
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Joined: 05 Jul 2013
Location: Illinois
Points: 1146 		Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Topic: Some questions on my AC 172 rotary mower...
    Posted: 22 Aug 2021 at 9:46pm
So I put the 172 mower on my "not restored" WD today (after adjusting the draw bar), and boy you can tell the difference, as the restored tractor has M&W pistons on it and will play great with the mower in heavy weeds. But it still did a good job.


Anyway, I thought I would try to remove the blades to measure and find replacements as these look bad, but I could not get the castle nuts to budge. Any tips?




I have thought of flap disc putting a new edge on these in place, but man they seem really badly worn.



Also, side bar, when I adjusted my draw bar to attach the mower (I had in my head you want the draw bar all the way back to use the mower), this front bolt is literally seized in the bar... Guess I need to use a sledge to knock her free?
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DiyDave View Drop Down
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Joined: 11 Sep 2009
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Points: 53310 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2021 at 4:42am
Burn the nut off. the heat will probably help loosen the rest of it. there is a bushing between the blade and bolt, save that for re-use.Wink
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ac160 View Drop Down
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Points: 395 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ac160 Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2021 at 8:08am
Most castle nuts have a key  through the castle to keep it from turning.   It almost looks like you can see the key in your picture.

They didn't by chance weld the bolt to the drawbar did they?
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Leon n/c AR. View Drop Down
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The tip end of the cotter pin is showing on the nut.  Leon
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SteveM C/IL View Drop Down
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Points: 8495 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2021 at 12:34pm
Generally there is a hole in the deck that lines up with the nut so you can put a socket through the top side. A 1in truck tire gun is perfect for that. You will be retirement age buy the time you sharpen with a flap disc. You need a BIG angle grinder but a baby will do. They aren't wore that bad except the rounded end. You'll need to take a good 1/8 in off the edge to get sharp again.
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DiyDave View Drop Down
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Points: 53310 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2021 at 6:38pm
The one thing that AC didn't do right on these mowers is to have a hole to put the wrench through...
You could take a hole saw to it, but check to see if you're drilling through any structural steel, sometimes there's something in the way...Wink
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garden_guy View Drop Down
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Points: 1146 		Post Options Post Options   Thanks (0) Thanks(0)   Quote garden_guy Quote  Post ReplyReply Direct Link To This Post Posted: 23 Aug 2021 at 7:32pm
DiyDave -- Heat seems like a good plan.

ac160 -- I don't think it's welded but I'll take a wire wheel to it to check.

Leon n/c AR -- I swear I removed the pin, but I'll make sure there isn't more left in there. It was rusted as heck.

SteveM C/IL -- Noted, I will go out and buy a grinding disc so I can put an edge back on it. Kind of interesting these mowers don't have an access hole in them.
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